It took me a couple years to realize this, but you can buy audio software secondhand. Used software is the same as new software (for obvious reasons), but with a little patience you can buy your plugins for far less than their sticker price (usually about 50% off). Here’s a list of places where you can buy your licenses; all of these are reputable communities with checks & balances to make sure you’re not paying for pirated software.
As always, make sure to pay via PayPal. I’ve been buying from these forums for a few years now, and I’ve only had good experiences!